remember, it's easier to swing a cello in anger than a piano.
Or to get stabbed by a bow:
I like to use the repeats as a chance to not repeat the mistakes I made the first time around
In sonata form, isn't the repeat to reinforce awareness of material before varying it in development?
I like to make entirely different ones, just to keep people on their toes.
No question, this is the classical standard. But as you point out, there are varied ways to approach this. Our Beethoven has several recitative passages which I think are better served by tentative/forceful, rather than the reverse. The passage as a whole, I'm not so sure. As a duo, we seem to find each other during the first go and it seems quite natural to play with more authority the second time round. Whether this is logical for an audience, I'm not so sure. It's logical for us.In writing, at least, it is the final statement that carries the most weight. So playing the second repeat with the most gusto makes a sort of literary or story-telling sense, before one moves on to the development. In many ways, sonata form evolved from opera, and the exposition of themes is analagous to the presentation of the characters. It doesn't seem odd, at least to me, to make the characters even more sharply edged upon their second appearance, before they start to undergo changes in the development.
This continues to happen to me as well despite my best efforts to the contrary. I'm beginning to think that's what repeats are for!
However, the problem in sonata form is that you have the recapitulation still to come. What happens then? If the repeat was forceful, shouldn't the sense of reprise usually be even more assertive?
Could you post your performance of the Beet's op 69?